WOW!! I cant' say enough about this product. My knees were hell. you could hear the bone rubbing on bone when i walk down the steps of the subway. I was told i had osteoarthis. i took this product and it brought me a long painful way. it really helped. i thought i would be cripple from the pain. you can't even exercise. now along with another product for inflamation i can walk normal again. the 4 stars **** is how far it brought me and the 5 is for the second product that took me the rest of the pain free way. I believe wtihout this product i would not have come this far.